Abrading unit



June 10, 1952 E WHlTE 2,599,961

ABRADING UNIT Filed Nov. 30; 1948 T'WH "mul" u MIMI l1 o# l loL EDWIN H. WHITE www ' cal to manufacture.

Patented June 10,n 195.2

y AUNITED STATES;

ABRADING UNIT Edwin rr'. White, Baltimore, Ma. v

Application-November 30, 1948, Serial No. 62,670 r 1 ciaim. (o1. 51+`190 The present invention relates to an abrading unit for use in a specially designed spindle which lis adapted to rotate the abrading unit within a terial and the supporting member.

The primary object of the invention is to provide an improved supporting member for an abrasive cloth, or material, operating within a cylindrical bore.

Another object of the invention is to provide an abrading unit which will be more uniform in its action, simpler in construction, and economi- While several objects, uses, and advantages. of the invention have been specifically pointed out, other uses and advantages may also become apparent as the invention is more fully disclosed in the detailed description and accompanying drawings in which:

Figure l is a vertical sectional view of a special spindle for supporting the abrasive units in operating position.

Figure 2 is an enlarged view in elevation of one form of the abrasive unit.

Figure 3 is an enlarged end view of a modied form of unit.

Figure 4 is an enlarged view in elevation of still another modified form of the abrasive unit.

Figure 5 is a sectional view taken along the line 5 5 of Figure 4.

Figures 6 and '7 are sectional views of still a further form of above unit.

Figure 8 is a view taken along the line 8-8 of Figure 2.

Referring to the drawings and particularly to Figures 4 and 5, which is the preferred form of the invention, there is shown an abrasive unit comprising an abrasive sheet I 0, a supporting member I2 and a holding clamp member Ill. The abrasive material is composed of a pliable cloth-like material, or paper, carrying an abrasive material on its face. 'Ihe supporting element is constructed of an elastic plastic material of substantially the same consistency throughout its larea and is reduced in thickness in the direction of one of its lateral edges. The support provides an elastic backing for the abrasive materials and by its tapered surface its elasticity is increased as the free edge I2 of the, support is approached. Y

The holding and clamping member I4 is formed of a rigid material such as metal, ahard plastic, or thelike. y l' To form the abradingunit, an abrasive material I0 is cut to a predetermined size, asbest shown in Figure 4, in :which there is provided several slots I6, I6 and I6. Adjacent the member il! there is placed the supporting member I2 which is preferably substantially narrower in width than the member Ill. 'The membersf'III and I2 are clamped together along one of their lateral edges by the holding and'clamping member I4 whichis upset at several points I'I and I'I' for increasing the holding action of the holding clamp. l

As mentioned before, this preferred-form 1of supporting-member I2 is taperedjtovvard one of its lateral edges.. In assembling' the'unit the thick portion I2' of the support isthe portion to be clamped by the holding member I4, and the thinner portion IZ" extends outwardly in the direction of the free edge I0 of the abrasive member.

The clamped edges of the abrasive members and the supporting members are defined along the general line I3 which is substantially the same as the inner surface of the closed end of the U-shaped clamping member I4. In Figure 3 there is illustrated a modified form of support which is quite similar to that shown in Figures 4 and 5. In this form the support 2i) is reduced in thickness by a series of steps 20 and 20" which have substantially the same effect in increasing the elasticity of the support as its free edge is approached.

Figures 6 and 7 show still another form of support in which the supporting member 22 is originally formed with both lateral edges 22' and 22" tapered, and when assembled the edge 22 is folded over upon the edge 22 and clamped together with the abrasive member ill by the member I 4, as shown in Figure 7.

A still further modification is shown in Figures 2 and 8. In this particular supporting member, the support 2li is of uniform thickness and the flexibility of the member is determined by the number and location of the apertures 26. By placing these apertures close together and adjacent the free edge 2d the member is made more elastic in this area. These apertures may be of any convenient number, or size, which Will sui'liciently increase the normal elasticity of the support as the free end 24' is approached.

These abrading units are adapted-to be inserted l into a special spindle as shown iinFigure Y1. The spindle comprises a central shaft 30 particularly adapted to be receivable into a standard chuck 0I a portable Velectrical,handdrilll There is an upper cap '32 and alower cap 34 for -llolding the ends L4,a n,d 14 ofthe holding Vmember I4 4and acentral'bpdy portion 3B .having ,slots 38 for receiving the end portions kl 4' and J4" of the member .I4 and `to holdthem in .asubstantially radial position. Theabradmg are held within the 1 spindlefby the nut .Ml-operating against the lbotmmesptu.

Incineration. .the shaft 30 is Vlocked in a rotaty,able chuck and ,inserted .into .a Cylinder -(not shewnl .the outer endsof Tthe abrasive member .l0

`will rsentant the .cylinder walls upon rotation ,of .the spindle Vand v,trentenne an .abrading kaction themen. .The :elastic supports .are adapted to sheep .abrasive .members `in constant contact with the cylinder wall as they are rotated Within thelbgre.

while the present disclosure describes fand iliustrates .several speelde .species ai fthe .improved abrasive unit, itiis .nbtlntended to be a limita-tion.

4 as the scope of the invention will be best defined in the appending claim in which I claim:

An abrading unit for portable cylinder treating tools having a rotatable holding frame for said unit, said unit comprising a single U-shaped clamping member having its ends extending outwardly beyond the unit to engage the tool holding frame, a, thin flexible abrasive sheet, a single ta- Perrtl :elastic.supportinghee't .of :substantially the same size 'as the thin sheet for supporting the ,.same, the U-shaped clamp adapted to clamp the thicker edge of the tapered member and the single 'edge of the thin abrasive member together throughout their entire length to form a single integralunit whereby the thin abrasive sheet and l.the taperedsheet .are held in close contact with each other by the said clamp which in turn is holdable within the tool holding frame EDWIN H. WHITE.

REFERENCES CITED v'The following references :are of :record in the ville of this patent.:

UNITED STATES PATENTS Number Name Date Y56.455.357 Black July '28, .1896 v963,523 Grismore ,....IulyJ 19.10

1,519,167 Towl Mar. 30, 1926 1,590,068 Grimes Mar. 15, 1928 1,794,092 Phillips .-Feb. 24,1931 1;949,565 Eldvvards v- .Man '6, 1934 2.1.94:.577 Vcnnegut M Man. 1940 2,259,475 Koether Oct. '21, 941 2,413,165 .'Bonkowski f-Dec. 24, 1946 :2,415,367 Pavlovic Feb. 4. 1947 2,423,992 Nordgrenet al, July 15, 11947 ,2,430,060 Lamb et al. Novfi, 19.47 2,529,105 Rogers llov. 7, 1950 

